Now I'm confused

after reading the post and replies about the "Ebay Commando" in Au I am confused as to what I have...

I could not find any markings on the head other than "BIRCO" no other casting marks of stamps. Where should I be looking for any other marking?

On the Cyl base it has the same "BIRCO" and a upside-down "B" on the left side rear, on the right side is the number 063850

the engine, trans & frame numbers match 300032 with a build date of 6 73

additionally, there are two numbers stamped into the frame itself on the neck tube: 28 and 00100

Also, the gap between the cyl and the head is about 1/2 the size of the gap between any of the other fins...

The cylinder head designation should be stamped above the off side exhaust rocker cover. Typically I can't find a picture for reference.

Sounds like you have a 850. Your head is probably a RH4.
The stamp is under the head stay on the right side above the exhaust tappet cover.

Sawsall said:

the engine, trans & frame numbers match 300032 with a build date of 6 73

Click to expand...

Yes it's an 850, as all 850s had a 3***** engine number, so it would not originally have been a tuned Combat model.

Sawsall said:

Also, the gap between the cyl and the head is about 1/2 the size of the gap between any of the other fins...

Click to expand...

That's quite normal, so is nothing to worry about.

S'interesting as I was looking for the very same thing at the w/e, couldn't find mine either.

The engine number is S/200535, the bike doesn't have matching numbers, tho that's not that unusual :roll: Anyway it was registered in '72, tho manufactuer was in '71. It also hasn't got any of the breather mods, either. The question I'd like to ask is; Should they be done? I bought the rebuild vids from NOC, Mick Hemmings was showing the holes drilled in the timing case + the pipe bracket in the blank space.

Cheers,

H